package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * @author Administrator
 */
@Component
public class RedisIdWorker {
    /**
     * 开始时间戳
     */
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    /**
     * 序列号位数
     */
    private static final  int COUNT_BITS=32;

    private static final  long BEGIN_TIMESTAMP = 1735689600L;

    public long nextId(String keyPrefix){
        //1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);;
        long timestamp = nowSecond - BEGIN_TIMESTAMP;

        //2.生成序列号
        String date = now.format(DateTimeFormatter.ofPattern("yyyyMMdd"));
        Long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);

        //3.拼接并返回
        return timestamp<<COUNT_BITS | count;
    }

    public static void main(String[] args) {
        LocalDateTime time = LocalDateTime.of(2025,1,1,0,0,0);
        long second = time.toEpochSecond(ZoneOffset.UTC);
        System.out.println("second ="+second);
    }
}
